Research On Process Experimental Of CBN Grinding Head Processing Cobalt-Based Superalloy Thin-walled Parts

Cobalt-based superalloy material is an important material in the field of aeroengine manufacture,which has been greatly developed by our country in recent years.It has very good mechanical properties.However,it is also a typical hard-to-process material with poor processing quality and low efficiency,which seriously hindered the rapid development of China's aero-engine manufacturing industry.Therefore,many domestic colleges and universities are studying how to improve the cobalt-based superalloy material processing efficiency and processing quality.As cobalt-based superalloy commonly used for thin-walled parts,thin walled pieces of low rigidity during processing,processing technology is poor,it is easily affected by the grinding force,grinding heat and grinding chatter vibration and surface deterioration occurred.Therefore,the grinding force,grinding temperature,grinding flutter,grinding surface quality is the grinding process of the four most important aspects,we face the four aspects of theoretical derivation,finite element simulation,experimental verification,study each grinding The influence of machining parameters on the above four aspects of grinding is studied.Based on the regularity,genetic algorithm is used to optimize the optimal machining parameters.In this paper,slot grinding grinding head cobalt-based superalloy thin-walled parts can improve the processing efficiency of cobalt-based superalloy thin-walled parts,and contribute to the processing quality of the optimal processing parameters.The main contents of this paper are as follows:(1)By comparing the grinding mechanism between common grinding head and slotting grinding head,a grinding force model of grooved grinding head is established based on the general grinding force model,and the model is verified by experiment.According to the theory and experiment,the influence of different grinding parameters on the grinding force is also discussed.(2)The theoretical grinding force model of continuous grinding and intermittent grinding is established respectively in the theory of triangular heat source distribution model in grinding zone.The influence of different grinding head and grinding parameters on the grinding temperature field is studied by means of finite element simulation and experimental verification.(3)Analyzes the influencing factors of grinding chatter,establishes the dynamic model of grinding cobalt based alloy alloy thin-walled parts,the modal test of thin-walled and grinding,and the grinding chatter stability model drawing grinding chatter stability lobes,analyzes the different effect of grinding grinding width on the stability of grinding parameter range.(4)The surface quality of cobalt based superalloy thin walled parts after processing is analyzed from four aspects:surface microstructure,microhardness,machined surface topography and surface roughness.The influence of the change of various grinding parameters on the surface quality is also studied.(5)A theoretical model for grinding the surface roughness of a slotted grinding head is established,and the influence of grinding parameters on the grinding parameters is studied in combination with the experimental data.The processing parameters are optimized based on genetic algorithm.Finally,the material removal rate is greatly improved on the basis of ensuring a certain surface roughness.